<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .wrap{
      width: 1200px;
      margin: 0 auto;
      border: 1px solid #999;
    }
    .header{
      width: 1000px;
      height: 40px;
      line-height: 40px;
      text-align: center;
      margin-top: 20px;
      margin-left: 100px;
      background: burlywood;
    }
    .content{
      width: 860px;
      margin: 0 auto;
      /* margin: 20px 0; */
    }
    .content .nav{
      margin:20px 0;
      height: 80px;
      line-height: 80px;
      text-align: center;
      background: burlywood;
    }
    .clearfix::after{
      content: ' ';
      display: block;
      clear: both;
      height: 0;
      overflow: hidden;
      visibility: hidden;
    }
    .content .list01 .item{
      float: left;
      margin-right: 20px;
      margin-top: 20px;
      width: 200px;
      height: 60px;
      line-height: 60px;
      text-align: center;
      background: burlywood;
    }
    .content .list01 .last{
      margin-right: 0;
    }
    .content .list02 .item{
      float: left;
      margin-right: 20px;
      margin-top: 20px;
      width: 200px;
      height: 100px;
      line-height: 100px;
      text-align: center;
      background: burlywood;
    }
    .content .list02 .last{
      margin-right: 0;
    }
    .footer{
      width: 1000px;
      height: 80px;
      line-height: 80px;
      text-align: center;
      /* margin-top: 20px;
      margin-left: 100px; */
      margin: 20px 100px;
      background: burlywood;
    }
  </style>
</head>
<body>
  <div class="wrap">
    <!-- 头部 -->
    <header class="header">top</header>
    <div class="content">
      <nav class="nav">banner</nav>
      <article class="list01 clearfix">
        <section class="item">1</section>
        <section class="item">2</section>
        <section class="item">3</section>
        <section class="item last">4</section>
      </article>
      <article class="list02 clearfix">
        <section class="item">5</section>
        <section class="item">6</section>
        <section class="item">7</section>
        <section class="item last">8</section>
      </article>
    </div>
    <footer class="footer">bottom</footer>
  </div>
</body>
</html>